导管螺旋桨水动力学性能的影响因素

为了获取导管螺旋桨水动力性能的主要影响因素，指导导管螺旋桨的优化设计，采用计算流体力学CFD对Ka4-7010+19A导管螺旋桨进行水动力性能研究，分析不同导管长度、导管攻角、螺旋桨纵倾角及多导管组对其水动力特性的影响。结果表明：减少导管长度将使推力系数及扭矩系数同时增大，而敞水效率下降；适当增加导管长度可以略微提高其敞水性能；减小导管攻角在一定进速范围内使推力系数和扭矩系数同时大幅度增加，增加导管攻角将导致推力系数和扭矩系数同时下降；当螺旋桨纵倾角保持在10°以内时，不会对敞水性能产生太大影响。对于多导管螺旋桨而言，前置、后置及不同附属导管直径大小都对敞水性能有很大影响，其中后置大导管组螺旋桨能明显降低螺旋桨扭矩系数，并且能在低进速范围内提升敞水效率。研究成果可支撑导管螺旋桨的优化设计。

Study on the impact factors to the hydrodynamic performance of ducted propeller

In order to study on the key impact factors to hydrodynamic performance of the ducted propeller, the open-water performance of Ka4-7010+19A ducted propeller is analyzed by computational fluid dynamics (CFD). The effects of the length of duct, attack angle of duct, rake angle of propeller and multiple-ducted propeller on the hydrodynamic characteristics are studied. The results show that the thrust coefficient and the torque coefficient can rise with reducing the length of duct, while the open water efficiency declines, and increasing the length of duct can slightly improve the open water performance. Reducing the attack angle at a certain range of advance coefficient can increase the thrust coefficient and torque coefficient greatly, however increasing the attack angle causes the thrust coefficient and the torque coefficient to decline at the same time. For the rake angle of propeller, when the angle is less than 10 degrees, the open water performance basically keeps the same level. For the multiple-ducted propeller, pre-set-attached-duct and post-set-attached-duct and different attached-duct diameter size have a great impact on the hydrodynamic performance, the post-set -attached-duct with a bigger diameter size can significantly reduce the propeller torque coefficient, and increase the open water efficiency at lower advance coefficient. The studying results are helpful to improve the design of ducted propeller.